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<p>This example toggles the debug LED (pin 13) on or off when a button on pin 2 is pressed.</p>
<div class="fragment"><div class="line"></div><div class="line">// This example toggles the debug LED (pin 13) on or off</div><div class="line">// when a button on pin 2 is pressed.</div><div class="line"></div><div class="line">// Include the Bounce2 library found here :</div><div class="line">// https://github.com/thomasfredericks/Bounce2</div><div class="line">#include &lt;Bounce2.h&gt;</div><div class="line"></div><div class="line">#define BUTTON_PIN 2</div><div class="line">#define LED_PIN 13</div><div class="line"></div><div class="line">int ledState = LOW;</div><div class="line"></div><div class="line"></div><div class="line">Bounce debouncer = Bounce(); // Instantiate a Bounce object</div><div class="line"></div><div class="line">void setup() {</div><div class="line">  </div><div class="line">  debouncer.attach(BUTTON_PIN,INPUT_PULLUP); // Attach the debouncer to a pin with INPUT_PULLUP mode</div><div class="line">  debouncer.interval(25); // Use a debounce interval of 25 milliseconds</div><div class="line">  </div><div class="line">  </div><div class="line">  pinMode(LED_PIN,OUTPUT); // Setup the LED</div><div class="line">  digitalWrite(LED_PIN,ledState);</div><div class="line"> </div><div class="line">}</div><div class="line"></div><div class="line">void loop() {</div><div class="line"></div><div class="line">   debouncer.update(); // Update the Bounce instance</div><div class="line">   </div><div class="line">   if ( debouncer.fell() ) {  // Call code if button transitions from HIGH to LOW</div><div class="line">     ledState = !ledState; // Toggle LED state</div><div class="line">     digitalWrite(LED_PIN,ledState); // Apply new LED state</div><div class="line">   }</div><div class="line">}</div><div class="line"></div></div><!-- fragment --> </div><!-- contents -->
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